Thanks for all the responses so far. I'm replying in one big reply, instead of 
individual replies, because people are kind-of saying the same things, so a 
single reply will suffice.

I realized what I really want is ZFS on osx, but since the death of zevo and 
greenbytes, I've outruled that option. So I just googled for it again, and 
apparently there is another project currently maintained, O3X. (Openzfs On 
OsX). https://openzfsonosx.org

I'll try this, and setup snapshot replication for the guest OS, and see what 
happens. It might be just what I'm looking for.

I agree that RDP is pretty good nowadays, but the RDP experience is definitely 
*not* as good as physical, for several reasons. First, all the little graphics 
effects of Aero are disabled over RDP, which significantly worsens the user 
experience. That in itself is enough for me to call it fatal to the intended 
use case. Similarly, TeamViewer et al might be ok for occasional usage, 
enabling mobility. Definitely not good enough for everyday use.

It is a no-go, to backup the files inside a VM, and *separately* periodically 
backup the whole VM, in such a way that requires the guest VM to be shutdown, 
and user driven. My experience is that any backup requiring manual intervention 
or user interruption doesn't actually occur. It needs to be automatic and 
non-intrusive, or else it doesn't happen.

For some users, a need to reinstall windows as part of the recovery process 
might be ok - such as accountants etc, who just need MS Office and My Documents 
- but for others (usually the people I support) developers and engineers have 
massive tooling installed, with lots and lots of configuration. It normally 
takes a few days of effort, up to a week of manual effort, to reinstall and 
reconfigure all the development tools. For this reason, whole-system snapshots 
and bare metal recovery to a completely configured, fully functional state are 
vital.

I will look at VMWare Horizon View.

I will also look at NX. I know the whole purpose of NX is to be a better 
alternative to VNC and X and RDP. I know for linux servers, NX beats the crap 
out of VNC. I don't know if NX will provide a nearly-native experience for 
running a windows desktop. Will give it a try.

After trying O3X.  :-)
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